Method on_idle_timeout

example/streaming_echo_c++/server.cpp:43–45

        return 0;
    }
    virtual void on_idle_timeout(brpc::StreamId id) {
        LOG(INFO) << "Stream=" << id << " has no data transmission for a while";
    }
    virtual void on_closed(brpc::StreamId id) {
        LOG(INFO) << "Stream=" << id << " is closed";
    }